How to get values from resultset when using subquery???

Hi ,
I have a problem in executing sql query from java.
I am executing an sql query which return a intersection of values from 3 tables.
Here is the query I am using
select id from dps_user where id in (select from dps_user b,laserlink c
where c.userid='univ.'||b.login and c.status in(1,3,8,9,10)
select from dps_user b,laserlink c
where c.userid=b.login and c.status in(1,3,8,9,10)).
this query is working fine from sql .
when I am trying to excute the same query from java nothing is coming into resultset.
String ISP_AND_EMAIL="select id "+
                         " from dps_user where id in (select from dps_user b,laserlink c "+
                              "where c.userid='"+"univ.'"+" ||b.login and c.status in(1,3,8,9,10)"+
                              " intersect "+
                              " select from dps_user b,laserlink c"+
                              " where c.userid=b.login and c.status in(1,3,8,9,10))";
How to use concatinate string (|| ) in java.
can anyone help to retrieve the values from this resultset...

concatnation is done using + in java.
I am doubtful about the following line where there may be error
"where c.userid='"+"univ.'"+" ||b.login and c.status in(1,3,8,9,10)"+
I don't know if the univ. is a string or some variable.I need more clarification on this line,then i may help u.

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